Means for fixing the picture carrier on copper intaglio printing cylinders



D.. 27, WEE., K. HINTSCHES MEANS FOR FIXING THE PICTURE CARRIER ON COPPER INTAGLIO PRINTING CYLINDERS Filed April 1, 195e Flgfl Patented Dec. 27, 1938 UNITED STATES PATENT OFFICE DERS Karl Hintsches, Oberkotzau, Germany Application April 1, 1936, Serial No. 72,055

- In Germany August 3, 1935 1 Claim.

The application of the form on the copper cylinder is effected by means of the photographic copying process. With this object in view the picture carrier is applied onto the copper cyl- 5 inder coated with a light sensitive layer, and the copper cylinder thus treated is then exposed to the action of light.

Up to the present it is very difficult to securely hold the picture carrier in its position on the copper cylinder. The fixation must be absolutely secure and such that the picture carrier is fixed tightly and non-shiftable. To full these requirements is rather difficult for the reason that the means which are at disposal are inadequate, as the fixing means must not interfere in any way with the picture on the picture carrier. It is diflicult to securely fix on the cylinder especially the middle portion of the picture carrier, which consists of a film placed around the cylinder and the width of which is equal to the length of the cylinder, especially at its middle portion.

This invention relates to a fixation means for the picture carrier on copper intaglio printing cylinders, consisting of a band of transparent material, such as Celluloid wound around the picture carrier placed on the copper cylinder, the ends of said band being securely held on the copper cylinder by rubber rings, clamps or the like.

The fixation according to the invention makes it possible to hold the picture carrier on the cylinder wall free from blisters and tightly tting, whereas the rubber rings, clamps and the like on the end of the Celluloid strip eiect the xation of the strip as well as of the picture carrier.

(Cl. S-775) In comparison with the holding devices of known type the advantage is obtained that accurate, easy and rapid adjusting of the picture carrier is possible. The possibility is further given to expose the whole copper cylinder by uniformly 5 rotating the same, this being especially important for adjusting around the whole circumference of the cylinder.

An embodiment of the invention is illustrated by way of example in the accompanying drawing 10 in Which:-

Fig. 1 shows in elevation a copper cylinder ready for exposure.

Fig. 2 is a similar view, partly in section.

Fig, 3 is an end View of the copper cylinder. 15

On the copper cylinder a having a lightsensitive coating, the picture carrier b is applied, i. e. placed around the cylinder. A transparent band c, for instance of Celluloid, is wound in spiral shape around the picture carrier, the two ends of 20 the band being secured in position by rubber rings d. The transparent band may be cut to a certain shape and of any desired width.

I claimz- Means for fixing the picture carrier on copper intaglio printing cylinders, comprising a band strip of transparent material wound in helical form over the picture carrier applied onto the copper cylinder, the windings of said strip overlapping at their edges, and means for fixing the ends of said band strip on the cylinder.

CAI

KARL HINTSCHES. 

